IKO AquaBarrier Mastic is a unique, modified asphalt sealant that is formulated with synthetic rubbers for longevity and glass fibers for extra strength. AquaBarrier Mastic is fully compatible with IKO waterproofing, air and vapour barrier and roofing system products. It can be applied on damp or dry surfaces and will not slump or pull away from the substrate. AquaBarrier Mastic may be used in simple applications to repair loose shingles, flashings, chimneys and vents. Additional areas of use include sealing terminations, membrane edges and around penetrations.